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The Laguna Copperplate Inscription (Filipino: Inskripsyón sa binatbát na tansô ng Laguna) is an official acquittance (debt relief) certificate inscribed onto a copper plate in the Shaka year 822 (Gregorian A.D. 900). It is the earliest-known, extant, calendar-dated document found within the Philippines. [1]
Lee Kee Group Limited (HKEx: 0637), commonly referred to as Lee Kee, is a prominent supplier of non-ferrous metals based in Hong Kong that operates across Asia, established in 1947 by Chan Chak Hong. The company achieved a milestone on October 4, 2006, by being listed on the Main Board of the Hong Kong Stock Exchange .
Xingye Alloy Materials Group Limited ( SEHK : 505) was formerly known as Huan Yue Interactive Holdings Limited, and Xingye Copper International Group Limited, one of the leading high precision copper producer in China. It mainly involves in producing high precision copper plates and strips, tin phosphorus bronze plates and strips, brass plates ...
Copper(II) ions migrate through the electrolyte to the cathode. At the cathode (reduction reaction), Cu 2+ ions are reduced in copper metal and Cu (s) plates out, but less noble constituents such as arsenic and zinc remain in solution unless a higher voltage is used. [52] The reactions involving metallic copper and Cu 2+ ions at the electrodes ...
Freeport-McMoRan. Freeport-McMoRan Inc., often called Freeport, is an American mining company based in the Freeport-McMoRan Center, in Phoenix, Arizona. The company is the world's largest producer of molybdenum, a major copper producer and operates the world's largest gold mine, the Grasberg mine in Papua, Indonesia.
Caltex began in Singapore when Texas Company (China) Ltd was established in the then-British colony in 1933. It was renamed Caltex in the 1950s. [ 45 ] In 1979, Caltex acquired a one-third interest in Singapore Refining Co. Pte. Ltd. (SRC) (the balance held by BP and Singapore Petroleum Company ), which operates a 285,000 barrels per day ...
Jiangxi Copper (simplified Chinese: 江西铜业; traditional Chinese: 江西銅業) (SSE: 600362) is the largest copper producer in Mainland China.Its operations include copper mining, milling, smelting and refining to produce copper-related products, including pyrite concentrates, sulfuric acid and electrolytic gold and silver.
Electroless copper plating. Electroless copper plating is a chemical process that deposits an even layer of copper on the surface of a solid substrate, like metal or plastic. The process involves dipping the substrate in a water solution containing copper salts and a reducing agent such as formaldehyde. [1]